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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b00392672a24110f60b65a5afea9b7a0c694a01c73cc1f4043d4a88321289c4' 
  AND token = '/lf06fOzT65X1oZg6GvzVWu1umzhS56tPKHusOOjKeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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