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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1254f9626aa18ba197e14b8a954d5b32829c7162d519557c0c66ba8aa574a72' 
  AND token = '7cgW/qR78dXwcRx1li9BAdzcKKzvkj14pRURvbLNeD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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