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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9e9f3943d53ebdbd1b3d5e4060343c16c031d667fda327804a3b5cf4611f92' 
  AND token = 'u5tlGhve22JHeWa49GOV4ni/t0MWbDXeaMK5V9BJ6Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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