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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963dcada5011708be44f505f47d9c7cb565714745963f13287740b6f42945464' 
  AND token = '0ExJ4GgxGL3g4vyUu0Q5+wMRKAyv6zhNtjERAlaWJIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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