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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae773b95d96ab4ca4dc5cd1284c824f28305360c25186cb5e5b5bf9cd4574bb' 
  AND token = 'hqg97DRAYj3U+a3PNiLHr94syeG/WF83YG6Xnlr3HRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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