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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b87ca8e8e0f04fbcbdef2e93e5350c01081fa5e0fe58bec67efcd3eb1ab7aa4' 
  AND token = '1EvZhwV2/WGpHRYeXgc4ry1MB+AweJB9CgLQIVSKMl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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