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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61416e0d1cc926f5ce68c303e943fdbc806e3ceb0ecab6df7a5a46c3098f43c' 
  AND token = '4qyYuMaq3a43z4mVM6hdlwL1NWGkslCVsMjGr05EUGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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