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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac80f3ffe14a11f025d2b41edba7851b8ea68af12f0d5b605ea4b52a2cf5b20' 
  AND token = 'eGIy0PwRTeDQqpPvx/3hvuaLpXZqkA4FaXJEJryqDco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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