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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393112d728a2011c77a1f6584afd95279be78a38c5b8e37832a766501f7be33c' 
  AND token = 'I9tJhh0/9DkEielrFf8fkxud6pCBUlyfOO/xyasJZ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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