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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21aace3ba1486129be9de5c93ef71955401152b08fe65c633f06696c6087cb8c' 
  AND token = '9IgceLZtM/s83tf0/bYAzsgAmK/e6jOiyCB+Kq+zYE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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