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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4abcaa1da3a2504a21e8b4ad48c6a69b7d2fa3ae6bdc28cef72163915ee4005' 
  AND token = 'jH+PWyW5H0Btpvz20KjC5eB1tBuSMc20N3Ho2pq3DfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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