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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216c4f36b3ff6a20cb44a997ed546329ae290e792665e1759a36b9e2a0356f21' 
  AND token = 'eT4dbUo2t1+bJep70XD3DTuN1SjPv5PrDTigPnOa57Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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