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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271fff43db492a01072fa6bb2f5648d9ee24a2fa2c15030d3062417fdf21f4b2' 
  AND token = 'yHKfrtbt6xEd9Hp/8WfPZNIXEV9zNtd8x3KtTd6Nv+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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