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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e8f27abe1ed4739b8f53470cd04d68a09735fad1564e151a4a3d70245c7ba98' 
  AND token = '47g/C8wu4YRQ5uE7SdKCG6/tQ1qT6gtueJlbR2pXLF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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