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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0d52c5ed4c48b872ddd081899172cd83643dbf18c9de8b10b4e9a265dcf9f2' 
  AND token = '2AS4XuP9haQWupU+NcCTyhWnd+ofVFYomLlp5bRUlT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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