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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d8000169cc413d7a9a89f9bfb591081bd991d9d59ec967461bed9cb2f1b4da' 
  AND token = 'SboFo64qpneiLBmt3IaCmstCQRJGO3xxH1LPKVaoKmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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