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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae151c9824c6c3326b822d8259e76ce806fbd51cda222c7a31edb262b3cb4b3' 
  AND token = 'ul84xtsSHNez6EfbxZeSjySxsKSAbM6xuK5W15ArMnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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