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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bbd45ab949305bed6724a3a227684eba6f1f298988a497405169bac5177904' 
  AND token = 'zqJEaFz0oEFJ/Qi6Q3R1+wz9c1OgpaMTZH03wHXAhLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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