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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6524c2238d7d8fd7988a44380e9b74e3f0b3bb6c551fd1f56a8d1cdc9096f8' 
  AND token = 'oMWfvIJ++iwdQQWXDHzqIZ0m4SwicRaDnRrdbpq63YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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