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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19aae9607a171cf16ef9f6c7c37c94eaf1deecd200c5aba329b12b07c67ed3f6' 
  AND token = '5FAp3K7DE+0tCj5YJTDiCDF9T9qZVxgx0RZDm4ROYV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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