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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4ef98905cc197f4b2ffd5afe323aa496193a2d828afab1a0042bd7609cbddf' 
  AND token = 'oDgIqifzbJ6gKn67YyCtqPMTo1/iG8PvEYp72cwCuTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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