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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c110e482ecad366d47fa94585fee9719ca7e46e699d182b0b94fbcccfb3831' 
  AND token = 'd3oxTD/wgcJJQlM1lLtmauD0Ef3aeZFd7hxhmovT5CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}