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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a799ba0ec0a23b2ee4b4f75b5be9e7c5dd5b6f32a00526a3a7a9695956050f98' 
  AND token = 'YMebfH/WvoDWPNeBRsfDAB6OL3VSALxakMwPM/ePYe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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