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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefdd3810ae154f6eccbdf3a4b5e0ddb7efae8394510b4ceaf7a0ac84244e0ee' 
  AND token = 'Hl9jpVELwTY1vBmY27GNupjdZ9NBFV4NuLpMfqNm37Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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