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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d006eda569d7a602e64d47d5f99bdc7b00610ca33cf9d7dd7cda7eff23673a' 
  AND token = 'xi1tvkHzyOHfZB9CXscU4GVZrVDToWO9bR0ttFnJUP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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