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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf10142243399b73a71f37d88da28515c1bf18604fb89caf1ffc908c569cfaa5' 
  AND token = 'SwdLGAqjccyq8nQx43Oq1jhH06iM9TtZOypy4wkLj8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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