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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a583d84d0bd4ba7a85c65e750675a5b80cec74dacd9f8732bfccc72583a91d7' 
  AND token = 'n1s0LMP4nxczbUZZEF6DQoFrlKuR/nm1i6yMQfNrjjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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