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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56c5609545f9732d6d3a59dad654f44492c1930ea5d24e3e460b99349ebe2ab' 
  AND token = 'p1giZon3UZktVUEhhLHm/VPiVLqQfYf8Y9Lbq8mriAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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