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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cb2926409f08d3d3cf584e8d2c37c139c5a5b09a11b13b9b4606acde0cb1a3' 
  AND token = 'bDijuY7v+HGs0Rs25ZYahZEAo0lQ0WyDgA5qY41JY2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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