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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74e50f03b891a9067db6a2d69858a28589294dc2c0d913d8396b05cd3c51024' 
  AND token = 'D58HH0LHnnjcnfGgxWxu2j1rqL6LMGN73ij8ko3NUos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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