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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a7ce99454cfd695ca2c77a01a33226ccf45c905c338c5479428a87ae251035' 
  AND token = '38AYaYzTgvHubcJZ35BJcCmB16tuah0QP/cRj8tBZxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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