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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abba1e062dddb871010a8e0c74fb3d38797f1e2e71119e8e377ec2b4de3091ab' 
  AND token = '2JAjM6e3LMWZkYvRk9H4NRzDbOLzMzpa6nQtpOpJcN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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