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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b1fbbfdf4870e32c9fb84a75ed273a570746a9cb0d4588ae5cd0ddf9010a3e' 
  AND token = '/sivO5bSNGOdHQopiuNdzekUdy7N2CvnIsCqxxXxjuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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