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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef54f8220f38338b0b44733d5e02ff72c8d8afafab341f8bbecaf59f9102e92' 
  AND token = 'dlSlxpfAVlG3H9Z/j162TngIwvXTGCO/3idCELmNyf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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