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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b236275b9f5020aa0c1dc0a93afd9f0cac1dde3c1f9c9814de1be422bbec45' 
  AND token = 'C8ogKXQPB+k7bjY6S/L8Z3wBeP/Xqj6O+hf4asfxPys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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