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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1903b24eb54eedd665c384ff3153762d5a7b1dff393b98812495b2c9e76518' 
  AND token = '0k42VElDj+2AIkO929P+uU7Qfqy3Sdxl+LML1STOoc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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