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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53707cc34c7c08be418425c9652d9a62b2cd7e393fe1739e64524747d3e249d' 
  AND token = 'bwQsYv26CrDvYUteaBdRov+rvBK8pOEiIu1knqPwv8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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