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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530fda462efc8173c2166ea1081456edd190b1139827871d60b598f18ed7cfb9' 
  AND token = 'v2s41xwGk4Gy3/rd+pgHeFW0iBi0FJ1LxJ9oqCz8OEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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