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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2828b6d2678d49ec2140320949c6bf128dbe206682c523b6abc4ef71d7d8e278' 
  AND token = 'yMbKOMST7Q/1r7Q57tymuL2zFSvUK2Y+Ne/5uTdghvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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