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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d5a7de0b2030f88f04f278996b255bd699961a368a9040fe1c6679c6ac06fc' 
  AND token = 'rbo9/b7W64d7u1oFc1R0WgwducGIeJ7YC0UkbcBSCIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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