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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5337d7c4f7a39aad464324a4c5f5d5873e580cb5c2c6ecdb7c92ad444d231246' 
  AND token = 'hNb1KoAUMrkGtsIb+Pv0iEG7s3LFVPKeZUa32h66l18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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