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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970443eec2654762b4530854540c4e553445ae2eba2e6b158949f9fdaf73054e' 
  AND token = 'eHS2gypKGz/bpoQNUDuOqR/YSDOeEmTUzjpkIta5VVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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