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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf38fbd77efc1dee645fcc201647a4895874ffdfd8c32040b3f11cd00d5fdb3' 
  AND token = 'B8ujHHTn5WL5CH1EdnLuCg8edontp5nhxKu4BpjevnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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