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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076dfbe4f8290df2f59294a3ac4bc6210b492d7ccd26f2cf4adc6e036db5fc68' 
  AND token = 'zEkyEZVHFx3z9jhWpUjgW0eJs4pLmFku4CsVcmF9bFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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