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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49b0283ac817f5585876dd431547af84b7ee2412febc3e7ac0cec0d71479e87' 
  AND token = '/rgleEqFuT9Ayq1siftfQZqPyUucF95BIHeqh+KNk2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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