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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858536d7f568ac3199205d38d20b1672309b215b71547b1e46e626a78ad9fe64' 
  AND token = 'Lo7S/QgEQpCs4at4j3mtzHBTC1ntBfXLfgQxYr2sao4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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