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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa649da543489353883abb05d6698260a68788360abfc4bee65d013fbb324cf0' 
  AND token = '/cd35SD18Yz8xrSoZ/dLWcQR7ATMYR2fwEHnG7qLXME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00141

JSON explain

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