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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadfd52a78d0cf1793c566e0062f86c6733116713fb08031d4402f6eff118d04' 
  AND token = 'FwdjTaa/0Qs4VssJWOsEv+uSeKszgEQuHkV8aFRfR7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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