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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f62e5f8ae33bfcc78ef85dafcd14d05fa87d5b3bf697df907d6557db2cb925' 
  AND token = 'To4H0l6qvKbuylQoJEKONbR6v78PYEjTc5xMkYHsoyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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