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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31764761ec1397e2db0479f1e06891b6eea900ec513593c4ef87569af2f5692a' 
  AND token = 'PwgfvDzXeWXk3lXhYo9oWFgtHTwA35btbti10aIizbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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