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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4da6ed4c010c34ff2f606414ca9e99ccc39426201ae45e0722d1383f4a56aac' 
  AND token = 'XCwBnjDvsXjWMMv8BKVC5Nzsjv+/2eF1K8y5bLea7Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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