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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b954dea9c710f2b7ff66f11401c9bc5e3ba1f0791081d64af62ffe322f11b5e3' 
  AND token = 'k135uEIvNN0n18xSxrbGKJqw3ZNXPklkVI+Sgvksmcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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