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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a0be3e83ebe76d05d8a51ed21a9e5b55a54f826afcb967b002dc71843f7e6b' 
  AND token = '6nuuEbK5DZ/9dOHzVW2y1uns6lcGXb+UWzo1j13Ec04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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