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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a739c06d183ba05741c5fe1bde350ac4909c96e44130488b5466f5fd537844ab' 
  AND token = 'AzEYF9G/ZhGS8NeQVcukIOMcpFWtMFSbnK76MH/+XTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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