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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13efb41950460229c9f57f9b60a490f3e88f292a78ae5d48c372c4f172d4017' 
  AND token = 'xhyOEI/4dWauwTBpQmf1SHMNt1CsPmuucoj0yL3pLsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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