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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69f7cb7e794f3fa2a120a09303d7a4c118b07afeaeda0b5dbdf4fac8825c7ee' 
  AND token = 'Bi3y5biC7GSY5KXsOk6nn54C/3Y7DTpqmETmwEwECjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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