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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0edf7fcdf6862d67ea979d95d02e27ac83e8d5e26199248b4b8c4aecc5d89fe2' 
  AND token = 'sax1fjsO5b9BZoflNQjnRv4NhGX54n8XEDXxzv1weWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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