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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc5a5e0f14b56376b0758150df2618ead6acb274ec0c232ccbc028d2735560b' 
  AND token = 'Yfbwzlt0NWwn+VMaZaSFflO4+aBFUzk74JdPmO7o5PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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